期刊
JOURNAL OF INSECT PHYSIOLOGY
卷 56, 期 12, 页码 1863-1870出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jinsphys.2010.08.007
关键词
Helicoverpa armigera; Larval host plants; Diapause incidence; Pupal weight; Adaptive significance
资金
- National Basic Research Program of China (973 Program) [2006CB102006]
- National Nature Sciences Fund [30070128]
Facultative diapause a strategy that allows insects to initiate additional generations when conditions are favorable or to enter diapause when they are not has a profound effect on the ecology and evolution of species Most previous studies have concentrated on the role of photoperiod and temperature in inducing facultative diapause in insects In contrast here we studied pupal diapause mediated by larval host plants in the cotton bollworm Helicoverpa armigera and confirmed that pupal weight is a critical factor Two groups of third instar H armigera larvae kept at 25 C with L D = 8 16 and 20 C with photoperiod of L D = 8 16 respectively were fed on six host plants and on artificial diet (as a control) to determine how larval host plants affect diapause incidence and related traits (such as pupal weight and developmental duration) The data showed larval host plants affected diapause incidence significantly and the effects could be masked by low temperature Further analysis showed that pupal size not the length of the sensitive stage affected the decision to enter diapause In a further experiment third-instar to final-stage larvae deprived of artificial diet for 2 days demonstrated a direct relationship between pupal weight and diapause incidence These results suggest that larval host plants by affecting pupal size may influence diapause occurrence in H armigera This has important adaptive significance for both over-wintering survival and the possibility for completing an additional generation (C) 2010 Elsevier Ltd All rights reserved
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